The frequency of development and severity of side effects depend on the duration of application, the amount of dose used and the possibility of observing the circadian rhythm of the appointment. Usually dexamethasone well tolerated. It has a low mineralocorticoid activity, that is, its effect on water-electrolyte metabolism is small. As a rule, low and medium doses of dexamethasone do not cause delays in sodium and water in the body, increased excretion of potassium.
The following side effects are described:
Disorders from the endocrine system: a decrease in glucose tolerance, "steroid" diabetes mellitus or the manifestation of latent diabetes mellitus,suppression of adrenal function, Itzenko-Cushing syndrome (lunar face, obesity of the pituitary type, hirsutism, increased blood pressure, dysmenorrhea, amenorrhea, myasthenia gravis, striae), delay in sexual development in children.
Violations of the blood and lymphatic system: moderate leukocytosis, leukocyturia, lymphopenia, eosinopenia, polycythemia.
Disorders from the gastrointestinal tract: nausea, vomiting, abdominal pain, discomfort in the epigastric region, pancreatitis, steroid ulcer of the stomach and duodenum, erosive esophagitis, bleeding and perforation of the wall of the stomach and intestines, increase or decrease in appetite, flatulence, hiccough. In rare cases - increased activity of "liver" transaminases and alkaline phosphatase.
Violations from the heart and blood vessels: arrhythmias, bradycardia (up to cardiac arrest); development (in predisposed patients) or progression of CHF, electrocardiographic changes characteristic of hypokalemia, increased blood pressure, hypercoagulation, thrombosis and thromboembolism, vasculitis, increased fragility of capillaries.In patients with acute and subacute myocardial infarction - the spread of the focus of necrosis, slowing the formation of scar tissue, which can lead to rupture of the heart muscle.
Disturbances from the nervous system: increased intracranial pressure, pseudotumor of the cerebellum, headache, convulsions.
Disorders from the psyche: nervousness or anxiety, insomnia, emotional lability, delirium, disorientation, euphoria, hallucinations, manic-depressive psychosis, depression, paranoia, suicidal tendencies.
Violations from the side of the organ of vision: posterior subcapsular cataract, increased intraocular pressure with possible damage to the optic nerve, propensity to develop secondary bacterial, fungal or viral eye infections, trophic corneal changes, exophthalmos, corneal perforation, central serous chorioretinopathy.
Hearing disorders and labyrinthine disorders: dizziness, vertigo.
Disorders from the metabolism and nutrition: hypercholesterolemia, increased excretion of calcium ions, hypocalcemia, weight gain, negative nitrogen balance (increased protein breakdown), increased sweating, epidural lipomatosis.
Caused by mineralocorticosteroid activity - fluid retention and sodium ions (peripheral edema), hypernatremia, hypokalemic syndrome (hypokalemia, arrhythmia, myalgia or muscle spasm, unusual weakness and fatigue).
Disturbances from musculoskeletal and connective tissue: slowing the growth and processes of ossification in children (premature closure of epiphyseal growth zones), osteoporosis (very rarely - pathological bone fractures, aseptic necrosis of the head of the humerus and thigh bone), rupture of muscle tendons, steroid myopathy, muscle loss (atrophy).
Disturbances from the skin and subcutaneous tissues: delayed healing of wounds, petechiae, ecchymosis, thinning of the skin, atrophy of the skin and subcutaneous tissue, hyper- or hypopigmentation, "steroid" acne, striae, propensity to develop pyoderma and candidiasis, skin pigmentation (hypo- or hyperpigmentation), telangiectasia.
Immune system disorders: generalized (skin rash, skin itching, anaphylactic shock), local allergic reactions.
Infectious and parasitic diseases: development or exacerbation of infections (the emergence of this side effect is facilitated by jointly used immunosuppressants and vaccination), masking infections.
General disorders and disorders at the site of administration: withdrawal syndrome.